VXLAN MP-BGP EVPN L2 VNI

MP-BGP

Let’s start with the MP-BGP EVPN configuration. There are two global items we need to configure:

SPINE1, LEAF1 & LEAF2
(config)# feature bgp
(config)# nv overlay evpn

This is why we need to enable these two commands:

• You need feature bgp so you can use the router bgp command.
• You need nx overlay evpn otherwise, you can’t configure address-family l2vpn evpn under router bgp.

Now, we can configure MP-BGPN. I’ll start with the spine switch:

SPINE1(config)# router bgp 123
SPINE1(config-router)# neighbor 2.2.2.2
SPINE1(config-router-neighbor)# remote-as 123
SPINE1(config-router-neighbor)# update-source loopback 0
SPINE1(config-router-neighbor)# address-family l2vpn evpn
SPINE1(config-router-neighbor-af)# send-community 
SPINE1(config-router-neighbor-af)# send-community extended
SPINE1(config-router-neighbor-af)# route-reflector-client

SPINE1(config-router)# neighbor 3.3.3.3
SPINE1(config-router-neighbor)# remote-as 123
SPINE1(config-router-neighbor)# update-source loopback 0
SPINE1(config-router-neighbor)# address-family l2vpn evpn
SPINE1(config-router-neighbor-af)# send-community 
SPINE1(config-router-neighbor-af)# send-community extended 
SPINE1(config-router-neighbor-af)# route-reflector-client

This turns SPINE1 into a route reflector for the L2VPN EVPN address family. We also need extended communities enabled.

We’ll configure the leaf switches as route reflector clients:

LEAF1 & LEAF2
(config)# router bgp 123 
(config-router)# neighbor 1.1.1.1
(config-router-neighbor)# remote-as 123
(config-router-neighbor)# update-source loopback 0
(config-router-neighbor)# address-family l2vpn evpn
(config-router-neighbor-af)# send-community 
(config-router-neighbor-af)# send-community extended

that’s all for bgp…

VNI and NVE

Let’s configure the VNI and NVE interface. We’ll do this on both leaf switches:

LEAF1 & LEAF2

(config)#feature vn-segment-vlan-based
(config)#feature nv overlay

(config)# vlan 10
(config-vlan)# vn-segment 10010
(config-vlan)# exit

(config)# interface nve1
(config-if-nve)# no shutdown
(config-if-nve)# host-reachability protocol bgp
(config-if-nve)# source-interface loopback 0
(config-if-nve)# member vni 10010
(config-if-nve-vni)# mcast-group 239.1.1.1

This configuration is exactly the same as we have seen previously, with one exception. We now use the host-reachability protocol bgp command. This tells the leaf switches to learn MAC addresses in the control plane (using MP-BGP) and not on the data plane.

This completes our configuration.

Verification

Let’s verify our work. The NVE interface is up:

LEAF1# show nve vni
Codes: CP - Control Plane        DP - Data Plane          
       UC - Unconfigured         SA - Suppress ARP        
       SU - Suppress Unknown Unicast 
       Xconn - Crossconnect      
       MS-IR - Multisite Ingress Replication
 
Interface VNI      Multicast-group   State Mode Type [BD/VRF]      Flags
--------- -------- ----------------- ----- ---- ------------------ -----
nve1      10010    239.1.1.1         Up    CP   L2 [10]

Note that the mode now shows up as Control Plane (CP). Let’s send some traffic between the hosts: